/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.rest.service.api.management;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.ManagementService;
import org.activiti.engine.runtime.Job;
import org.activiti.rest.service.api.RestActionRequest;
import org.activiti.rest.service.api.RestResponseFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author Frederik Heremans
 */
@RestController
public class JobResource {

    private static final String EXECUTE_ACTION = "execute";

    @Autowired
    protected RestResponseFactory restResponseFactory;

    @Autowired
    protected ManagementService managementService;

    @RequestMapping(value = "/management/jobs/{jobId}", method = RequestMethod.GET, produces = "application/json")
    public JobResponse getJob(@PathVariable String jobId, HttpServletRequest request) {
        Job job = getJobFromResponse(jobId);

        return restResponseFactory.createJobResponse(job);
    }

    @RequestMapping(value = "/management/jobs/{jobId}", method = RequestMethod.DELETE)
    public void deleteJob(@PathVariable String jobId, HttpServletResponse response) {
        try {
            managementService.deleteJob(jobId);
        } catch (ActivitiObjectNotFoundException aonfe) {
            // Re-throw to have consistent error-messaging acrosse REST-api
            throw new ActivitiObjectNotFoundException("Could not find a job with id '" + jobId + "'.", Job.class);
        }
        response.setStatus(HttpStatus.NO_CONTENT.value());
    }

    @RequestMapping(value = "/management/jobs/{jobId}", method = RequestMethod.POST)
    public void executeJobAction(@PathVariable String jobId, @RequestBody RestActionRequest actionRequest, HttpServletResponse response) {
        if (actionRequest == null || !EXECUTE_ACTION.equals(actionRequest.getAction())) {
            throw new ActivitiIllegalArgumentException("Invalid action, only 'execute' is supported.");
        }

        try {
            managementService.executeJob(jobId);
        } catch (ActivitiObjectNotFoundException aonfe) {
            // Re-throw to have consistent error-messaging acrosse REST-api
            throw new ActivitiObjectNotFoundException("Could not find a job with id '" + jobId + "'.", Job.class);
        }

        response.setStatus(HttpStatus.NO_CONTENT.value());
    }

    protected Job getJobFromResponse(String jobId) {
        Job job = managementService.createJobQuery().jobId(jobId).singleResult();

        if (job == null) {
            throw new ActivitiObjectNotFoundException("Could not find a job with id '" + jobId + "'.", Job.class);
        }
        return job;
    }
}
